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libavformat
data_uri.c
Go to the documentation of this file.
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/*
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* Copyright (c) 2012 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "
libavutil/avstring.h
"
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#include "
libavutil/base64.h
"
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#include "
url.h
"
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typedef
struct
{
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const
uint8_t
*
data
;
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void
*
tofree
;
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size_t
size
;
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size_t
pos
;
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}
DataContext
;
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static
av_cold
int
data_open
(
URLContext
*h,
const
char
*uri,
int
flags
)
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{
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DataContext
*
dc
= h->
priv_data
;
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const
char
*
data
, *opt, *next;
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char
*ddata;
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int
ret
, base64 = 0;
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size_t
in_size;
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/* data:content/type[;base64],payload */
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av_strstart
(uri,
"data:"
, &uri);
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data = strchr(uri,
','
);
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if
(!data) {
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av_log
(h,
AV_LOG_ERROR
,
"No ',' delimiter in URI\n"
);
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return
AVERROR
(EINVAL);
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}
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opt = uri;
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while
(opt < data) {
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next =
av_x_if_null
(memchr(opt,
';'
, data - opt), data);
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if
(opt == uri) {
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if
(!memchr(opt,
'/'
, next - opt)) {
/* basic validity check */
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av_log
(h,
AV_LOG_ERROR
,
"Invalid content-type '%.*s'\n"
,
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(
int
)(next - opt), opt);
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return
AVERROR
(EINVAL);
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}
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av_log
(h,
AV_LOG_VERBOSE
,
"Content-type: %.*s\n"
,
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(
int
)(next - opt), opt);
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}
else
{
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if
(!
av_strncasecmp
(opt,
"base64"
, next - opt)) {
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base64 = 1;
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}
else
{
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av_log
(h,
AV_LOG_VERBOSE
,
"Ignoring option '%.*s'\n"
,
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(
int
)(next - opt), opt);
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}
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}
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opt = next + 1;
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}
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data++;
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in_size = strlen(data);
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if
(base64) {
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size_t
out_size = 3 * (in_size / 4) + 1;
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if
(out_size > INT_MAX || !(ddata =
av_malloc
(out_size)))
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return
AVERROR
(ENOMEM);
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if
((ret =
av_base64_decode
(ddata, data, out_size)) < 0) {
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av_free
(ddata);
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av_log
(h,
AV_LOG_ERROR
,
"Invalid base64 in URI\n"
);
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return
ret
;
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}
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dc->
data
= dc->
tofree
= ddata;
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dc->
size
=
ret
;
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}
else
{
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dc->
data
=
data
;
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dc->
size
= in_size;
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}
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return
0;
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}
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static
av_cold
int
data_close
(
URLContext
*h)
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{
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DataContext
*
dc
= h->
priv_data
;
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av_freep
(&dc->
tofree
);
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return
0;
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}
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static
int
data_read
(
URLContext
*h,
unsigned
char
*
buf
,
int
size
)
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{
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DataContext
*
dc
= h->
priv_data
;
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if
(dc->
pos
>= dc->
size
)
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return
AVERROR_EOF
;
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size =
FFMIN
(size, dc->
size
- dc->
pos
);
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memcpy(buf, dc->
data
+ dc->
pos
, size);
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dc->
pos
+=
size
;
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return
size
;
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}
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URLProtocol
ff_data_protocol
= {
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.
name
=
"data"
,
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.url_open =
data_open
,
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.url_close =
data_close
,
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.url_read =
data_read
,
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.priv_data_size =
sizeof
(
DataContext
),
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};
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1.8.2